package fr.upvm.lem3.vm3d.ui.swing.sliderbar;


import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JSlider;

/**
* An extension of JSlider to select a range of values using two thumb controls.
* The thumb controls are used to select the lower and upper value of a range
* with predetermined minimum and maximum values.
*
* <p>Note that RangeSlider makes use of the default BoundedRangeModel, which
* supports an inner range defined by a value and an extent. The upper value
* returned by RangeSlider is simply the lower value plus the extent.</p>
*/
public class RangeSlider extends JSlider {

    /**
	 * 
	 */
	private static final long serialVersionUID = 2269930199345543041L;

	/**
* Constructs a RangeSlider with default minimum and maximum values of 0
* and 100.
*/
    public RangeSlider() {
        initSlider();
    }

    /**
* Constructs a RangeSlider with the specified default minimum and maximum
* values.
*/
    public RangeSlider(int min, int max) {
        super(min, max);
        initSlider();
    }

    /**
* Initializes the slider by setting default properties.
*/
    private void initSlider() {
        setOrientation(HORIZONTAL);
        setBorder(BorderFactory.createMatteBorder(3,3, 3, 3, Color.LIGHT_GRAY));
        
    }

    /**
* Overrides the superclass method to install the UI delegate to draw two
* thumbs.
*/
    @Override
    public void updateUI() {
        setUI(new RangeSliderUI(this));
        // Update UI for slider labels. This must be called after updating the
        // UI of the slider. Refer to JSlider.updateUI().
        updateLabelUIs();
        
        }

    /**
* Returns the lower value in the range.
*/
    @Override
    public int getValue() {
        return super.getValue();
    }

    /**
* Sets the lower value in the range.
*/
    @Override
    public void setValue(int value) {
        int oldValue = getValue();
        if (oldValue == value) {
            return;
        }

        // Compute new value and extent to maintain upper value.
        int oldExtent = getExtent();
        int newValue = Math.min(Math.max(getMinimum(), value), oldValue + oldExtent);
        int newExtent = oldExtent + oldValue - newValue;

        // Set new value and extent, and fire a single change event.
        getModel().setRangeProperties(newValue, newExtent, getMinimum(),
            getMaximum(), getValueIsAdjusting());
    }

    /**
* Returns the upper value in the range.
*/
    public int getUpperValue() {
        return getValue() + getExtent();
    }

    /**
* Sets the upper value in the range.
*/
    public void setUpperValue(int value) {
        // Compute new extent.
        int lowerValue = getValue();
        int newExtent = Math.min(Math.max(0, value - lowerValue), getMaximum() - lowerValue);
        
        // Set extent to set upper value.
        setExtent(newExtent);
    }
}